[Bug 76276] Backlight control broken on Dell XPS13 w/ kernel 3.14-rc7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76276

--- Comment #44 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #43)
> I've just checked and kernels not using the mentioned quirk work like a
> charm with "Legacy Boot Rom" disabled in BIOS. (XPS13 IVY). This quirk
> (QUIRK_NO_PCH_PWM_ENABLE) causes backlight to turn completely off after
> kernel start on legacy-feee machines. Do we really have to reapply it in
> 3.14? Isn't disabling this option (which is a good thing performance-wise)
> engouth?

The rule is fixing the earlier regression wins.

Please make sure v3.15-rc5 works for you, and file a bug if it doesn't.

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